UEFI vs. bios, UEFI affects video card?

[kurtmeln]

I installed debian 8.5(xfce4 via DVD1) on a Dell Server PowerEdge R730, using UEFI and gpt. There is no other system on this workstation.
But dmesg gives some errors:

Code: Select all

dmesg |grep -i error
[    1.370299] ioapic: probe of 0000:00:05.4 failed with error -22
[    1.376361] ioapic: probe of 0000:80:05.4 failed with error -22
[    1.395785] ERST: Error Record Serialization Table (ERST) support is initialized.
[    9.954348] ACPI Error: No handler for Region [SYSI] (ffff88207e8271e8) [IPMI] (20140424/evregion-163)
[    9.962223] ACPI Error: Region IPMI (ID=7) has no handler (20140424/exfldio-297)
[    9.969985] ACPI Error: Method parse/execution failed [\_SB_.PMI0._GHL] (Node ffff88207e826310), AE_NOT_EXIST (20140424/psparse-536)
[    9.985574] ACPI Error: Method parse/execution failed [\_SB_.PMI0._PMC] (Node ffff88207e8262c0), AE_NOT_EXIST (20140424/psparse-536)
[   10.185149] EXT4-fs (dm-0): re-mounted. Opts: errors=remount-ro
[   10.561502] [drm:mga_vram_init] *ERROR* can't reserve VRAM
[   10.561506] mgag200 0000:0b:00.0: Fatal error during GPU init: -6

It seems that power function (I googled this ACPI Error and someone said this in a forum) and video card (the desktop is slow, because this graphics card (Matrox G200eR2) is poor and the desktop was slow in ubuntu too) do not work very well.
My questions are, are these errors related to UEFI? Should I reinstall debian via bios method (can this get rid of these errors?)? Or can I safely ignore these errors?
Thanks

[Head_on_a_Stick]

are these errors related to UEFI

No.

[kurtmeln]

Thank Head_on_a_Stick.
Just now I reinstalled the system via bios (but gpt partition). The dmesg errors are mostly the same (without the last two line).
However, the graphics card performs differently. In UEFI mode, the desktop is 1920x1080, resizing windows are slow; while in BIOS mode, the maximum resolution of desktop is 1600x900, no slow down on resizing windows.
/etc/X11/xorg.conf does not exist;
Can anyone can explain this?

[tuxserbia]

Actually, at least mga errors are/could be UEFI related

https://bugzilla.redhat.com/show_bug.cgi?id=1196714

[Head_on_a_Stick]

My apologies OP, it appears that I was wrong.

You can attempt to force the correct resolution by following these methods:
https://wiki.archlinux.org/index.php/Xr ... esolutions
https://wiki.archlinux.org/index.php/Xr ... esolutions

[kurtmeln]

Thank you all. I have kept the bios method.
The desktop is not very important since it is a server. For the 'ACPI Error', it seems that there is no solution yet.
I will come back to report if fatal system errors encountered in future.