Re: matroxfb: cannot determine memory size

[Paul Menzel <pmenzel@molgen.mpg.de>]

[Cc: +regressions@, +stable@]

#regzbot ^introduced: 62d89a7d49afe46e6b9bbe9e23b004ad848dbde4


Dear Helge,


Thank you for your prompt reply.

Am 16.12.22 um 00:02 schrieb Helge Deller:
> On 12/15/22 17:39, Paul Menzel wrote:

>> Between Linux 5.10.103 and 5.10.110/5.15.77, matrixfb fails to load.
>>
>> ## Working:
>>
>>      [    0.000000] Linux version 5.10.103.mx64.429 (root@theinternet.molgen.mpg.de) (gcc (GCC) 7.5.0, GNU ld (GNU Binutils) 2.37) #1 SMP Mon Mar 7 16:41:58 CET 2022
>>      [    0.000000] Command line: BOOT_IMAGE=/boot/bzImage-5.10.103.mx64.429 root=LABEL=root ro crashkernel=64G-:256M console=ttyS0,115200n8 console=tty0 init=/bin/systemd audit=0 random.trust_cpu=on systemd.unified_cgroup_hierarchy
>>      […]
>>      [    0.000000] DMI: Dell Inc. PowerEdge R910/0KYD3D, BIOS 2.10.0 08/29/2013
>>      […]
>>      [   48.045530] matroxfb: Matrox MGA-G200eW (PCI) detected
>>      [   48.054675] matroxfb: 640x480x8bpp (virtual: 640x13107)
>>      [   48.059966] matroxfb: framebuffer at 0xC5000000, mapped to 0x00000000ca7238fa, size 8388608
>>
>> ## Non-working:
>>
>> ### 5.10.110
>>
>>      [    0.000000] Linux version 5.10.110.mx64.433 (root@theinternet.molgen.mpg.de) (gcc (GCC) 7.5.0, GNU ld (GNU 
>> Binutils) 2.37) #1 SMP Thu Apr 14 15:28:53 CEST 2022
>>      [    0.000000] Command line: root=LABEL=root ro crashkernel=64G-:256M console=ttyS0,115200n8 console=tty0 init=/bin/systemd audit=0 random.trust_cpu=on systemd.unified_cgroup_hierarchy
>>      […]
>>      [    0.000000] DMI: Dell Inc. PowerEdge R910/0KYD3D, BIOS 2.10.0 08/29/2013
>>      […]
>>      [   35.225987] matroxfb: Matrox MGA-G200eW (PCI) detected
>>      [   35.234088] matroxfb: cannot determine memory size
>>      [   35.238931] matroxfb: probe of 0000:09:03.0 failed with error -1
>>
>> ### 5.15.77
>>
>>      [    0.000000] Linux version 5.15.77.mx64.440 (root@theinternet.molgen.mpg.de) (gcc (GCC) 10.4.0, GNU ld (GNU Binutils) 2.37) #1 SMP Tue Nov 8 15:42:33 CET 2022
>>      [    0.000000] Command line: root=LABEL=root ro crashkernel=64G-:256M console=ttyS0,115200n8 console=tty0 init=/bin/systemd audit=0 random.trust_cpu=on systemd.unified_cgroup_hierarchy
>>      […]
>>      [    0.000000] DMI: Dell Inc. PowerEdge R715/0G2DP3, BIOS 1.5.2 04/19/2011
>>      […]
>>      [    9.436420] matroxfb: Matrox MGA-G200eW (PCI) detected
>>      [    9.444502] matroxfb: cannot determine memory size
>>      [    9.449316] matroxfb: probe of 0000:0a:03.0 failed with error -1
>>
>> We see it on several systems:
>>
>>      $ lspci -nn -s 0a:03.0 # Dell PowerEdge R715
>>      0a:03.0 VGA compatible controller [0300]: Matrox Electronics Systems Ltd. MGA G200eW WPCM450 [102b:0532] (rev 0a)
>>
>>      $ lspci -nn -s 09:03.0 # Dell PowerEdge R910
>>      09:03.0 VGA compatible controller [0300]: Matrox Electronics Systems Ltd. MGA G200eW WPCM450 [102b:0532] (rev 0a)
>>
>> I found some old log from April 2022, where I booted 5.10.109, and the 
>> error is not there, pointing toward the regression to be introduced 
>> between 5.10.109 and 5.10.110.
>>
>> ```
>> $ git log --oneline v5.10.109..v5.10.110 --grep fbdev

[…]

>> ```
>>
>> Is it worthwhile to test commit f8bf19f7f311 (video: fbdev: matroxfb: 
>> set maxvram of vbG200eW to the same as vbG200 to avoid black screen)?
> 
> Yes, it is.
> Please try and report back.
> It seems to be the only relevant patch, and it fits with the name of 
> your card.

I tested Linus’ master with commit 84e57d292203 (Merge tag 
'exfat-for-6.2-rc1' of 
git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/exfat) and the 
error is still there. Reverting commit fixes the issue.

Tested on:

     DMI: Dell Inc. PowerEdge R910/0KYD3D, BIOS 2.10.0 08/29/2013

Current master:

     [   36.221595] matroxfb 0000:09:03.0: vgaarb: deactivate vga console
     [   36.228355] Console: switching to colour dummy device 80x25
     [   36.234069] matroxfb: Matrox MGA-G200eW (PCI) detected
     [   36.239316] PInS memtype = 7
     [   36.242198] matroxfb: cannot determine memory size
     [   36.242209] matroxfb: probe of 0000:09:03.0 failed with error -1

After reverting 62d89a7d49af (video: fbdev: matroxfb: set maxvram of 
vbG200eW to the same as vbG200 to avoid black screen):

     [   38.140763] matroxfb 0000:09:03.0: vgaarb: deactivate vga console
     [   38.148057] Console: switching to colour dummy device 80x25
     [   38.153789] matroxfb: Matrox MGA-G200eW (PCI) detected
     [   38.159042] PInS memtype = 7
     [   38.161953] matroxfb: 640x480x8bpp (virtual: 640x13107)
2022-12-16T12:26:11.301999+01:00 invidia kernel: [   38.167175] 
matroxfb: framebuffer at 0xC5000000, mapped to 0x000000006f41c38c, size 
8388608

>> The master commit 62d89a7d49a was added to v5.18-rc1, and was also 
>> backported to the Linux 5.15 series in 5.15.33.


Kind regards,

Paul