Bug#822575: debian regression: no more console output after "switching to mgag200drmfb from simple"

From	Ben Hutchings <ben@decadent.org.uk>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#822575: debian regression: no more console output after "switching to mgag200drmfb from simple"
Date	2016-04-26 16:10 +0200
Message-ID	<rsbQC-Gm-23@gated-at.bofh.it> (permalink)
References	<rrPdp-6OH-23@gated-at.bofh.it> <rs6Hf-4gv-17@gated-at.bofh.it> <rs8g1-5TZ-13@gated-at.bofh.it> <rsaBc-7X7-7@gated-at.bofh.it>
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Cross-posted to 2 groups.

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On Tue, 2016-04-26 at 14:43 +0200, Harald Dunkel wrote:
> Without GRUB_GFXMODE and GRUB_GFXPAYLOAD_LINUX I get
> 
> Apr 26 13:07:57 usbpc kernel: [   18.245417] AES CTR mode by8 optimization enabled
> Apr 26 13:07:57 usbpc kernel: [   18.256518] alg: No test for fips(ansi_cprng) (fips_ansi_cprng)
> Apr 26 13:07:57 usbpc kernel: [   18.271819] fbcon: mgadrmfb (fb0) is primary device
> Apr 26 13:07:57 usbpc kernel: [   18.340257] ipmi_si IPI0001:00: Found new BMC (man_id: 0x000157, prod_id: 0x0048, dev_id: 0x21)
> Apr 26 13:07:57 usbpc kernel: [   18.340261] ipmi_si IPI0001:00: IPMI kcs interface initialized
> Apr 26 13:07:57 usbpc kernel: [   18.539515] Console: switching to colour frame buffer device 160x64
> Apr 26 13:07:57 usbpc kernel: [   18.577386] mgag200 0000:03:00.0: fb0: mgadrmfb frame buffer device
> Apr 26 13:07:57 usbpc kernel: [   18.585608] [drm] Initialized mgag200 1.0.0 20110418 for 0000:03:00.0 on minor 0
> Apr 26 13:07:57 usbpc kernel: [   18.588803] intel_rapl: Found RAPL domain package
> Apr 26 13:07:57 usbpc kernel: [   18.588817] intel_rapl: Found RAPL domain core
> 
> The console output doesn't get stuck, either.
> 
> > 
> > That might be an effect of the driver being confused by GRUB's
> > modesetting.  I don't know.
> Maybe. OTOH, upstream's kernel (built on unstable) just works,
> using the same grub configuration, installed on the same bootable
> USB stick and booted on the same hardware.

I'm guessing that you didn't built the mgag200 driver (CONFIG_DRM_MGA),
right?

> Do you think there could be a side effect of the recent patch
> cleanup for mgag200 & cirrus done for 4.4~rc5-1~exp1?

Yes, very likely.

Ben.

-- 
Ben Hutchings
The generation of random numbers is too important to be left to chance.
                                                            - Robert Coveyou

Thread

Re: Bug#822575: debian regression: no more console output after  "switching to mgag200drmfb from simple" Mattia Rizzolo <mattia@debian.org> - 2016-04-26 10:40 +0200
  Processed: Re: Bug#822575: debian regression: no more console  output after "switching to mgag200drmfb from simple" owner@bugs.debian.org (Debian Bug Tracking System) - 2016-04-26 10:40 +0200
  Bug#822575: debian regression: no more console output after "switching to mgag200drmfb from simple" Ben Hutchings <ben@decadent.org.uk> - 2016-04-26 12:20 +0200
    Re: Bug#822575: debian regression: no more console output after  "switching to mgag200drmfb from simple" Harald Dunkel <harald.dunkel@aixigo.de> - 2016-04-26 14:00 +0200
    Bug#822575: debian regression: no more console output after "switching to mgag200drmfb from simple" Harald Dunkel <harald.dunkel@aixigo.de> - 2016-04-26 14:50 +0200
      Bug#822575: debian regression: no more console output after "switching to mgag200drmfb from simple" Ben Hutchings <ben@decadent.org.uk> - 2016-04-26 16:10 +0200
        Bug#822575: debian regression: no more console output after "switching to mgag200drmfb from simple" Harald Dunkel <harald.dunkel@aixigo.de> - 2016-04-27 09:10 +0200
          Bug#822575: debian regression: no more console output after "switching to mgag200drmfb from simple" Ben Hutchings <ben@decadent.org.uk> - 2016-04-27 11:50 +0200
  Bug#822575: debian regression: no more console output after "switching to mgag200drmfb from simple" Harald Dunkel <harald.dunkel@aixigo.de> - 2016-04-26 14:40 +0200

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