> Can you please share you grub config file? It seems that is set to > GRUB_GFXMODE=1024x768x32 but the actual mode is set to 1024x768x24 ? Okay, but you'll be sorry... The gfxmode is set to "keep" in all the entries. https://www.panix.com/~pa/linux-6.3-simplefb/grub.cfg . The "TEST" entry was used to bisect. The "PRE-TEST" was to set things up, to receive the bzImages compiled on a faster machine. Now I boot the "Linux 6.3.0-rc5-x86". > That is, it fails when the picked format is DRM_FORMAT_RGB8888 but > works when is DRM_FORMAT_XRGB888. I can't spot any error in Thomas' > patch so I wonder if the problem is with what grub is passing to the > kernel. > > The mentioned vga=0x318 workaround that you mentioned makes the mode > passed to match the selected DRM_FORMAT_RGB888 which I guess is why > that worked for you. All right, I did a series of reboots, editing the grub command line to change the "gfxpayload=" grub option or the "vga=" kernel option. In each case I captured the output of "dmesg | egrep -i 'fbcon|console|fb0|frameb|simple|vga|vesa' https://www.panix.com/~pa/linux-6.3-simplefb/selected-modes (D'oh. My script printed "vga=vga=" twice when that option was set. Good enough as is.) Note the difference in linelength= between the bad and good r8g8b8. Does it mean anything ? (bad)> format=r8g8b8, mode=1024x768x24, linelength=4096 (good)> format=r8g8b8, mode=1024x768x24, linelength=3072
