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Re: Debian 9.4 and Aspeed/AST2400

Am Freitag, den 15.06.2018, 16:31 -0700 schrieb  Ryan C:
> Hello,
> We are having trouble getting Linux to function properly on SuperMicro
> hardware (X10SRI-F + E5-2620v4) which uses the AST2400 for VGA output. We have
> tried several "desktop" distributions: Ubuntu, Fedora, Xubuntu, Lubuntu, and
> Debian. As well as several versions of Ubuntu. We noticed the issue first
> starts with Ubuntu 16.04.2 and is still present in 18.04. In 16.04.1 and below
> the video is working fine. Debian is also using a newer kernel which has
> problems with this aspeed chip.  
> Our issue is that the video output is very very slow at updating. Even the TTY
> framebuffer console can be slow at rendering. We open a window or click a menu
> and we can see each line of the display being drawn very slowly. Similarly,
> the login screens respond very slowly to keyboard input and mouse lags and
> jumps around.
> We have narrowed the issue down to specifically to Linux Kernel version 4.9
> and above. Running Kernel version 4.8 or lower has no video issues at all.
> Is this a known issue? Is there a known fix? Maybe we need to roll back the
> There are two possible fixes we found, but they may just be covering up the
> issue rather than fixing it:
> 1) set the cpu frequency in Linux to the maximum speed, with "performance"
> governor. This helps, but doesn't completely solve the slow video rendering
> and tearing. Also, it is not permanent. 
> 2) Set the gpu/vga OPROM to "EFI" in the BIOS. This seems to fix the slow
> graphics issue on the desktop, but does not help with the slow rendering on
> the login screen.
> From what we can tell, the "ast" video driver is being used. Moving the ast
> kernel module from one system do another doesn't do anything, but switching
> between 4.8 and 4.9 is where everything breaks. 

Do you have the same issue in the KVM/HTML5 viewer over IPMI?

I use a X11SSM-F witch has also the AST2400. Currently I use the stretch-
backports kernel because the EDAC module of kaby lake cpu's is not supported in

With 4.15 I had some strange wrong color output during boot, the tty color
switched to red.
This issue was gone gone after the installation of intel-microcode from stretch-

Have a nice day,
Jens Sauer <jsauer65@xxxxxxxxx>

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