On Mon, May 30, 2016 at 9:50 PM, Ben Hutchings <b...@decadent.org.uk> wrote: > Control: reassign src:linux 4.5.4-1 > Control: tag -1 help > > On Mon, 2016-05-30 at 18:42 +0200, Mathieu Malaterre wrote: >> Package: linux-image-4.5.0-2-powerpc >> Version: 4.5.4-1 >> >> During Debian installation the background color is inverted on PPC system. >> At least on my Mac Mini G4, the default background color shows up as red >> from begining to start (only the last screen turn blue). >> >> Looking at the module loaded during the installation I can see radeonfb, >> which I suspect is the one responsible for handling of `/dev/fb0`. >> >> After installation I tried reproducing this color inversion without any >> luck so far. >> >> It is non-trivial to `rmmod radeon`, so instead I used (and rebooted): >> >> $ cat /etc/modprobe.d/radeon.conf >> blacklist radeon >> >> However upon reboot `/dev/fb0` is already setup. > > Of course, because there is no character-based display mode on Power > Macs (in general). > >> But neither radeonfb nor >> radeon module seems to be loaded (using lsmod) but lspci output is rather >> confusing [*]. > > lspci lists all kernel modules that match a particular PCI device's ID, > and separately whether any kernel driver is currently bound to the > device. > >> I can also see: >> >> $ cat /proc/fb >> 0 OFfb ATY,RockHo > > As I would expect, the generic Open Firmware framebuffer driver is > behind /dev/fb0. If a hardware-specific driver is loaded, that will > take over from it.
Thank you ! Ok now I understand. d-i tried to modprobe `radeonfb` but fails since framebuffer is already taken by Open Firmare, as can be seen in the dmesg log: [ 96.551486] radeonfb 0000:00:10.0: enabling device (0006 -> 0007) [ 96.551526] radeonfb 0000:00:10.0: BAR 0: can't reserve [mem 0x98000000-0x9fffffff pref] [ 96.551531] radeonfb (0000:00:10.0): cannot request region 0. [ 96.551545] radeonfb: probe of 0000:00:10.0 failed with error -16 One way to double check if color inversion happen using `radeonfb` is simply to type at boot: command line: install32 nomodeset video=offb:off (instead of the default `install32`). At least I know where too look now. Maybe the palette is setup backward for powerpc.
