Hi, > Hi > > Am 14.09.22 um 16:58 schrieb Wang Yugui: > > Hi, > > > >> (cc: Jocelyn) > >> > >> Hi > >> > >> Am 14.09.22 um 10:29 schrieb Wang Yugui: > >>> Hi, > >>> > >>> > >>>> Hi > >>>> > >>>> Am 13.09.22 um 17:15 schrieb Wang Yugui: > >>>> [...] > >>>>>>> > >>>>>>> so I tried to revert patch of mgag200 driver in batch of 2 or 3, the I > >>>>>>> noticed the patch 'Subject: drm/mgag200: Remove special case for G200SE > >>>>>>> with <2 MiB' and then tried this dirty fix. > >>>>>> > >>>>>> Oh, great work! Thank you. From looking at the screenshot that you provided, it seems as if the 24-bit mode setting is broken. I'm not sure why the G200SE workaround applies to a G200ER, but we'll see. > >>>>> > >>>>> I tested 'preferred_depth = 32' too. it works on T630 too. > >>>>> > >>>>> so both 16 and 32 work, but 24 failed on DELL/T630. > >>>> > >>>> I tried on my test machine with a 5.19 kernel and found that 32-bit and 24-bit pixels work, but 16-bit looks incorrect. > >>>> > >>>> What are the results if you boot your kernel 5.19.3 with the parameter video=1024x768-24? This should enable 24-bit pixels. > >>>> > >>>> How does video=1024x768-16 look with the 5.19 kernel? > >>> > >>> test result here > >>> kernel 5.19.3 & video=1024x768-24 > >>> dell/T620/centos-8.5 broken > >>> dell/T630/centos-7.9 broken > >> > >> I assume that Centos 7 and 8 have fairly old kernels? So it's been a long-standing bug. > > > > We install kernel 5.19.3/5.15.67 into Centos 7 and 8. > > default it work well. broken just when 'video=1024x768-24', so it may > > not a long-standing bug. > > I don't quite understand. Does 'video=1024x768-24' work with 5.15.67? kernel 5.15.67 with 'video=1024x768-24' is broken on DELL/T630. kernel 5.15.67 without 'video=1024x768-24' works well on DELL/T630. Best Regards Wang Yugui (wangyugui@xxxxxxxxxxxx) 2022/09/15
