Re: matroxfb: cannot determine memory size

[Helge Deller <deller@gmx.de>]

On 12/15/22 17:39, Paul Menzel wrote:
> Dear Linux folks,
>
>
> 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
> b1c28577529c video: fbdev: sm712fb: Fix crash in smtcfb_write()
> 681a317034b2 video: fbdev: udlfb: replace snprintf in show functions with sysfs_emit
> a7c624abf694 video: fbdev: omapfb: panel-tpo-td043mtea1: Use sysfs_emit() instead of snprintf()
> 543dae0a46b0 video: fbdev: omapfb: panel-dsi-cm: Use sysfs_emit() instead of snprintf()
> da210b1b551c video: fbdev: omapfb: acx565akm: replace snprintf with sysfs_emit
> 8c7e2141fb89 video: fbdev: cirrusfb: check pixclock to avoid divide by zero
> 1e33f197468f video: fbdev: w100fb: Reset global state
> 08dff4820127 video: fbdev: nvidiafb: Use strscpy() to prevent buffer overflow
> 066d9b48f949 video: fbdev: omapfb: Add missing of_node_put() in dvic_probe_of
> bf4bad1114a3 video: fbdev: fbcvt.c: fix printing in fb_cvt_print_name()
> 6de6a64f23a6 video: fbdev: atmel_lcdfb: fix an error code in atmel_lcdfb_probe()
> 64ec3e678d76 video: fbdev: smscufx: Fix null-ptr-deref in ufx_usb_probe()
> 0dff86aeb191 video: fbdev: controlfb: Fix COMPILE_TEST build
> ec1c20b02ae0 video: fbdev: controlfb: Fix set but not used warnings
> f8bf19f7f311 video: fbdev: matroxfb: set maxvram of vbG200eW to the same as vbG200 to avoid black screen
> 2ca2a5552a83 video: fbdev: atari: Atari 2 bpp (STe) palette bugfix
> 72af8810922e video: fbdev: sm712fb: Fix crash in smtcfb_read()
> ```
>
> 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.

Helge


>
> 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