problem with firefox 88

Krzysztof Mrozowicz krzysztof at
Wed May 5 13:44:48 CEST 2021

W dniu 05.05.2021 o 12:08, Jan Palus pisze:
> On 05.05.2021 12:50, Krzysztof Mrozowicz via pld-devel-en wrote:
>> W dniu 05.05.2021 o 11:35, Jan Palus pisze:
>>>> Downgraded to version 87 and happy days.
>>> Works for me. Did you try with fresh profile (firefox 
>>> -ProfileManager), mozilla's binary (package mozilla-firefox-bin) and 
>>> in case it still doesn't work stracing it?
>> I tried with fresh profile - the same effect. It seems like FF is 
>> reacting for clicking, but doesn't "re-paint" the interface accordingly.
>> When I, let's say click "+" to open a new tab, then minimize the 
>> window and restore it, the new tab is there. Double-clicking on the 
>> window title (maximize/un-maximize) also refreshes the interface. 
>> Firefox 88 from mozilla-firefox-bin behaves the exact same way.
>> Would you mind telling me how to strace the program in a correct way, 
>> please? I did it few times in the past but always I was googling the 
>> method.
> Ah ok, somehow I thought firefox hangs or fails to start for you. 
> That's probably an effect of enabling WebRender by default for 
> XFCE/KDE with Intel/AMD GPU so likely for you. Try disabling webrender 
> in about:config (|gfx.webrender.force-disabled=true). Which GPU? If 
> Intel are you using modesetting driver?

Zwycięstwo! Setting up the gfx.webrender.force-disabled=true made the 
firefox usable again. Thanks Jan!

Regarding the modesetting, I don't remember if I was tweaking any X 
config about that. My hardware is:
CPU: Intel(R) Core(TM) i7-2640M CPU @ 2.80GHz
GPU: VGA compatible controller: Intel Corporation 2nd Generation Core 
Processor Family Integrated Graphics Controller (rev 09)

And xorg.log:

# grep modesetting Xorg.0.log
[    18.622] (==) Matched modesetting as autoconfigured driver 1
[    18.628] (II) LoadModule: "modesetting"
[    18.628] (II) Loading /usr/lib64/xorg/modules/drivers/
[    18.629] (II) Module modesetting: vendor="X.Org Foundation"
[    18.632] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[    18.675] (WW) Falling back to old probe method for modesetting
[    18.682] (II) UnloadModule: "modesetting"
[    18.682] (II) Unloading modesetting


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