Bug 19799

i think we need to add: 

%ifarch %ix86
    -no-sse2 \
%endif

in other qt5 packages

Status comment: Will be done as soon as possible => (none)
CC: (none) => mageia

Something in the qt5 stack IS still requiring sse2.

On and up-to-date Mga6 i586 system with an Athlon XP 3200+ which Does Not support
sse2, plasma wil not run.

When I try to launch plasma from the DM all I get is a screen with the Mga background and a movable cursor nothing else.
I can switch to another tty and restart the DM launch gnome, xfce, lxde, etc;
and they all run without problem.

The issue also occurred when testing the pre-test Mageia-6-sta2-LiveDVD-Plasma-i586-DVD.

CC: (none) => cae

Using QEMU, I have confirmed Charles's deduction that sse2 is to blame. Using

qemu-system-i386 -cdrom Mageia-6-sta2-LiveDVD-Plasma-i586-DVD/Mageia-6-sta2-LiveDVD-Plasma-i586-DVD.iso -m 4G --enable-kvm -vga std -cpu qemu32

and forcing xdriver=modesetting, I can boot to a working desktop. Changing the -cpu option to "qemu32,-sse2" reproduces the behaviour Charles reports (eventually the Mageia Welcome screen gets displayed, but no desktop).

CC: (none) => mageia

Assigned to David Geiger as decided during the KDE Maintainer Group meeting.

Assignee: kde => geiger.david68210

Because it is built using the qt5 stack this bug applies also to sddm.
It will not work on a system whose CPU does not support see2.

David, Nicolas, any progress, any ETA?

Sorry I don't know how to fix that properly, so if someone else can do this job it would be great.

i don't think we have any sse2 enabled now ( please test new rpms ).

The issue still very much exists.


I just tested on a drive with a new Mga6 install and tested again on this established and fully up-to-date Mga6 installation.
Both installations are on seperate drives in the same system.

[charles@XP3200 ~]$ lscpu
Architecture:          i686
CPU op-mode(s):        32-bit
Byte Order:            Little Endian
CPU(s):                1
On-line CPU(s) list:   0
Thread(s) per core:    1
Core(s) per socket:    1
Socket(s):             1
Vendor ID:             AuthenticAMD
CPU family:            6
Model:                 10
Model name:            AMD Athlon(tm) XP 3200+
Stepping:              0
CPU MHz:               1837.000
CPU max MHz:           1837.0000
CPU min MHz:           1287.0000
BogoMIPS:              3674.02
Flags:                 fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow eagerfpu 3dnowprefetch vmmcall

1st Big red flag....if I try to use sddm as DM all I get is is an empty black screen.

When I use lxdm I can select plasma and login....but then all I get is the default Mga6 background screen with a movable mouse cursor and nothing else.
If I continue to let it run a small black square eventually appears in the top left hand corner of the Mga6 background.

I can run gnome, xfce4, lxde, at el on this system, though gnome is sluggish so I primarily use xfce4 or lxde.

Btw, the 32bit and noarch packages provided by qtdeclarative5-5.6.2-2.mga6.srpm, that was pushed by neoclust to fix this issue, are:


    libqt5qml-devel-5.6.2-2.mga6.i586
    libqt5qml5-5.6.2-2.mga6.i586
    libqt5quick-devel-5.6.2-2.mga6.i586
    libqt5quick5-5.6.2-2.mga6.i586
    libqt5quickparticles-devel-5.6.2-2.mga6.i586
    libqt5quickparticles5-5.6.2-2.mga6.i586
    libqt5quicktest-devel-5.6.2-2.mga6.i586
    libqt5quicktest5-5.6.2-2.mga6.i586
    libqt5quickwidgets-devel-5.6.2-2.mga6.i586
    libqt5quickwidgets5-5.6.2-2.mga6.i586
    qtdeclarative5-5.6.2-2.mga6.i586
    qtdeclarative5-doc-5.6.2-2.mga6.noarch 

@ Charles

You knew that and you made sure you have version 5.6.2-2.mga6 for each of them that's installed, didn't you?

CC: (none) => marja11

(In reply to Marja van Waes from comment #10)
> Btw, the 32bit and noarch packages provided by
> qtdeclarative5-5.6.2-2.mga6.srpm, that was pushed by neoclust to fix this
> issue, are:
> 
> 
>     libqt5qml-devel-5.6.2-2.mga6.i586
>     libqt5qml5-5.6.2-2.mga6.i586
>     libqt5quick-devel-5.6.2-2.mga6.i586
>     libqt5quick5-5.6.2-2.mga6.i586
>     libqt5quickparticles-devel-5.6.2-2.mga6.i586
>     libqt5quickparticles5-5.6.2-2.mga6.i586
>     libqt5quicktest-devel-5.6.2-2.mga6.i586
>     libqt5quicktest5-5.6.2-2.mga6.i586
>     libqt5quickwidgets-devel-5.6.2-2.mga6.i586
>     libqt5quickwidgets5-5.6.2-2.mga6.i586
>     qtdeclarative5-5.6.2-2.mga6.i586
>     qtdeclarative5-doc-5.6.2-2.mga6.noarch 
> 
> @ Charles
> 
> You knew that and you made sure you have version 5.6.2-2.mga6 for each of
> them that's installed, didn't you?

I made sure both the installation were fully up-to-date

[charles@XP3200 ~]$ rpm -qa |grep libqt5quick
libqt5quickparticles5-5.6.2-2.mga6
libqt5quick5-5.6.2-2.mga6
libqt5quickwidgets5-5.6.2-2.mga6
libqt5quicktest5-5.6.2-2.mga6
[charles@XP3200 ~]$ rpm -qa |grep qtdeclarative5
qtdeclarative5-5.6.2-2.mga6
[charles@XP3200 ~]$ rpm -qa |grep libqt5qml
libqt5qml5-5.6.2-2.mga6

how can i test this on VBox ?

IIRC something like this to modufy the vm you are testing with:

VBoxManage modifyvm <vm_name> --cpuidremove sse2

does not work, i obtain 


VBoxManage: error: 

asking on VBox irc channel, they told me this is not possible to do this kind of actions :/

Try using qemu, as described in comment 3. "-cpu qemu32,-sse2" emulates a CPU *without* SSE2 instructions.

testing now :)

Status: NEW => ASSIGNED

just tried and in lscpu i don't have see2.

Plasma starts, i can open the menu, dolphin, etc.

# LC_ALL=C lscpu
Architecture:          i686
CPU op-mode(s):        32-bit
Byte Order:            Little Endian
CPU(s):                1
On-line CPU(s) list:   0
Thread(s) per core:    1
Core(s) per socket:    1
Socket(s):             1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 5
Model name:            Pentium II (Deschutes)
Stepping:              2
CPU MHz:               1995.379
BogoMIPS:              3990.75
Hypervisor vendor:     KVM
Virtualization type:   full
Flags:                 fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pse36 mmx fxsr eagerfpu x2apic hypervisor

I don't know what to tell you.

I did a new clean install on a brand new drive on my test system this afternoon and still have the same issues.
Neither sddm or plasma will run|work on that system but other tested DMs and WMs
will work.

I'm not, but if you are convinced that there is no SSE2 issue you are welcome to close this bug as "Works for me"

We can look at re-opening should other users report similar problems.

I have not forgotten about this bug.

I just booted the pre-testing Mageia-6-sta2-LiveDVD-GNOME-x86_64-DVD.iso
on my Athlon XP3200+ to see if the outcome is the same.

Am attaching a picture taken from my phone of my plasma desktop.
How does it look to you?

Created attachment 8942 [details]
Plasma desktop png

I've just tested this by building a 32-bit Live Plasma DVD and running in qemu with sse2 disabled. Everything works for me. Maybe what Charles is seeing is a video driver problem.

@Charles, is this the system which had problems when I switched the GNOME default from Wayland to Xorg?

(In reply to Martin Whitaker from comment #22)
> I've just tested this by building a 32-bit Live Plasma DVD and running in
> qemu with sse2 disabled. Everything works for me. Maybe what Charles is
> seeing is a video driver problem.
> 
> @Charles, is this the system which had problems when I switched the GNOME
> default from Wayland to Xorg?

Yes it is.

But as it applies to plasma I've tried with both nvidia cards, nouveau and nvidia304 driver, and with ati cards, ati driver; and none could run plasma
or sddm.

If no one else sees or can reproduce this problem I would have no issue with the bug being closed as "Works for me".

i don't pass to find any "non see2" machine here :(  i installed on really old machines ( like P4 2.8Ghz ) and it has sse2.

Please try new qtdeclarative5

*** Bug 19258 has been marked as a duplicate of this bug. ***

CC: (none) => mkare

to be tested:   

src.rpm:  qtdeclarative5-5.6.2-5.mga6 
media:    core/release

some issues to build it, i come back when ready

Please test new qtdeclarative5


src.rpm:  qtdeclarative5-5.6.2-8.mga6 
media:    core/release

Should Be OK, please reopen if any pb

Status: ASSIGNED => RESOLVED
Resolution: (none) => FIXED