> And can you share the "linelength=" print out from simplefb ?
Okay. Three cases, see below.
Your patch tries to fix the stride, but what if it's the _depth_
that's wrong ? Grub sets the mode, the pre-regression kernel picks this:
format=x8r8g8b8, mode=1024x768x32, linelength=4096
========== Good ======================================================
grub: gfxpayload=1024x768x24
[ 0.003333] Console: colour dummy device 128x48
[ 0.003333] printk: console [tty0] enabled
[ 0.417054] fbcon: Taking over console
[ 0.513399] pci 0000:01:05.0: vgaarb: setting as boot VGA device
[ 0.513431] pci 0000:01:05.0: vgaarb: bridge control possible
[ 0.513455] pci 0000:01:05.0: vgaarb: VGA device added:
decodes=io+mem,owns=io+mem,locks=none
[ 0.513490] vgaarb: loaded
[ 3.337529] simple-framebuffer simple-framebuffer.0: framebuffer at
0xd8000000, 0x240000 bytes
[ 3.337567] simple-framebuffer simple-framebuffer.0: format=r8g8b8,
mode=1024x768x24, linelength=3072
[ 3.338000] Console: switching to colour frame buffer device 128x48
[ 3.566490] simple-framebuffer simple-framebuffer.0: fb0: simplefb
registered!
========== Bad after patch, typing blind to log in !==================
grub: gfxpayload=keep
[ 0.003333] Console: colour dummy device 128x48
[ 0.003333] printk: console [tty0] enabled
[ 0.423925] fbcon: Taking over console
[ 0.520030] pci 0000:01:05.0: vgaarb: setting as boot VGA device
[ 0.520061] pci 0000:01:05.0: vgaarb: bridge control possible
[ 0.520085] pci 0000:01:05.0: vgaarb: VGA device added:
decodes=io+mem,owns=io+mem,locks=none
[ 0.520120] vgaarb: loaded
[ 3.290444] simple-framebuffer simple-framebuffer.0: framebuffer at
0xd8000000, 0x240000 bytes
[ 3.290483] simple-framebuffer simple-framebuffer.0: format=r8g8b8,
mode=1024x768x24, linelength=3072
[ 3.290916] Console: switching to colour frame buffer device 128x48
[ 3.519523] simple-framebuffer simple-framebuffer.0: fb0: simplefb
registered!
========== Good, earlier kernel before regression ====================
grub: gfxpayload=keep
[ 0.226675] Console: colour dummy device 128x48
[ 0.228643] printk: console [tty0] enabled
[ 0.429214] fbcon: Taking over console
[ 0.524994] pci 0000:01:05.0: vgaarb: setting as boot VGA device
[ 0.525025] pci 0000:01:05.0: vgaarb: bridge control possible
[ 0.525049] pci 0000:01:05.0: vgaarb: VGA device added:
decodes=io+mem,owns=io+mem,locks=none
[ 0.525082] vgaarb: loaded
[ 3.320474] simple-framebuffer simple-framebuffer.0: framebuffer at
0xd8000000, 0x300000 bytes
[ 3.320513] simple-framebuffer simple-framebuffer.0: format=x8r8g8b8,
mode=1024x768x32, linelength=4096
[ 3.320983] Console: switching to colour frame buffer device 128x48
[ 3.415643] simple-framebuffer simple-framebuffer.0: fb0: simplefb
registered!
