Bug#800005: fbset gets 'ioctl FBIOPUT_VSCREENINFO: Invalid argument'

[Rick Thomas <rbthomas@pobox.com>]

On Jun 30, 2016, at 12:50 AM, Mathieu Malaterre <malat@debian.org> wrote:

> On Thu, Jun 30, 2016 at 9:45 AM, Rick Thomas <rbthomas@pobox.com> wrote:
>> Do I understand correctly that I should put “drm.debug=0xe” as a kernel argument at boot time?  Then boot, try running my “fbset” test and send you the entire output of dmesg including all boot messages.  Is this correct?
>> 
>> Further, I guess you would prefer to have this on the amd64 machine in question rather than the original powerpc machine?
>> 
>> What other info should I send?  If I use the amd64 machine, I guess you’d like some hardware configuration info as well?  Please be specific: a verbatim list of shell commands you’d like me to run would be most helpful!
> 
> Hi Rick,
> 
> Adding the boot parameter *should* tell us what went wrong in the
> fbset command. So yes I do expect you change the boot parameter, run
> dmesg before and after the fbset command. I do not care about amd64,
> so please do it on the powerpc.
> 
> Thanks.

Still no help…  
On powerpc64 (dual core Mac G5 running Debian 8.5):

> rbthomas@bigal:~$ dmesg > /tmp/dmesg-before.out
> 
> rbthomas@bigal:~$ fbset
> 
> mode "1680x1050"
>     geometry 1680 1050 1680 1050 32
>     timings 0 0 0 0 0 0 0
>     accel true
>     rgba 8/16,8/8,8/0,0/0
> endmode
> 
> rbthomas@bigal:~$ fbset 800x600-60
> ioctl FBIOPUT_VSCREENINFO: Invalid argument
> rbthomas@bigal:~$ grep 800x600 /etc/fb.modes 
> #	800x600, 48 Hz, Interlaced (36.00 MHz dotclock)
> mode "800x600-48-lace"
> #	800x600, 56 Hz, Non-Interlaced (36.00 MHz dotclock)
> mode "800x600-56"
> #	800x600, 60 Hz, Non-Interlaced (40.00 MHz dotclock)
> mode "800x600-60"
> #	800x600, 70 Hz, Non-Interlaced (44.90 MHz dotclock)
> mode "800x600-70"
> #	800x600, 72 Hz, Non-Interlaced (50.00 MHz dotclock)
> mode "800x600-72"
> #	800x600, 75 Hz, Non-Interlaced (49.50 MHz dotclock)
> mode "800x600-75"
> #	800x600, 90 Hz, Non-Interlaced (56.64 MHz dotclock)
> mode "800x600-90"
> #	800x600, 100 Hz, Non-Interlaced (67.50 MHz dotclock)
> mode “800x600-100"
> 
> rbthomas@bigal:~$ dmesg > /tmp/dmesg-after.out
> 
> rbthomas@bigal:~$ diff /tmp/dmesg-before.out /tmp/dmesg-after.out
> 
> rbthomas@bigal:~$ cat /proc/cmdline 
> root=/dev/mapper/bigal-root ro drm.debug=0xe
> 
> rbthomas@bigal:~$ lsmod | grep drm
> drm_kms_helper         82001  1 nouveau
> drm                   325466  6 ttm,drm_kms_helper,nouveau,sil164
> agpgart                39217  2 drm,ttm
> i2c_core               31058  10 drm,i2c_powermac,windfarm_smu_sat,drm_kms_helper,
>                                  i2c_algo_bit,windfarm_lm75_sensor,nouveau,sil164,
>                                  windfarm_max6690_sensor,snd_aoa_codec_onyx