Hi,
I need to run a set of (graphical) benchmarks with the screen disabled. The
following command did not work:
xset dpms force off
Because any keyboard/mouse input would re-enable the screen. The other option
was the following:
xrandr --output eDP-1 --off
This turns off the screen for a secon
originated
from the iGPU.
On Saturday, August 26, 2023, 08:10:15 PM GMT+4:30, Dave Howorth
wrote:
On Sat, 26 Aug 2023 15:28:52 + (UTC)
Ahmad Nouralizadeh wrote:
> I need to run a set of (graphical) benchmarks with the screen
> disabled.
Can I ask why? What is you'r
>> Those accesses might not stop with just the display off - some
>> applications may keep redrawing.
Will these accesses cause iGPU or dedicated GPU accesses to the DRAM? I think
that those redrawings originate from the processor.
>I'm not sure a graphical benchmark will run without a graphical
> > However, I would have expected that VLC would produce a lot
> > GPU/iGPU accesses even without drawing anything, because it would
> > try to use GPU decoder.
For the discrete GPU, the turned off screen requires much smaller bandwidth in
any benchmark (reduces from 2GB/s to several KB/s). The
> In order to display anything on the screen the video card needs an array
>of data given color of each pixel. This is usually called "framebuffer"
>because it buffers data for one frame of video.
Thank you for the enlightening explanation! An unrelated question: IIUC the
framebuffer is a share
> The framebuffer that is displayed on the monitor is always in video card
> memory. There is a piece of hardware (CRTC) that continuously pulls data
> from the framebuffer and transmits it to the monitor.
So the framebuffer memory should normally be in the kernel (Perhaps in special
cases coul
Thanks (also Dave and Carsten)! Full of useful information not easily found (if
even found) on the Internet! So, in summary, the communication is done through
a series of memory mapped regions in the address space of the graphics library
(e.g., OpenGL).The image data is transferred 1) from the X
Perhaps I didn't express my question precisely. I understand that you are
talking about the mmap function in the kernel which is usually a function
pointer in vm_operations...
My question is about the userspace structure of X11. IIUC, we have X11 clients,
which are GUI apps.They have a portion
Thanks Alan and Vladimir!These are very effective clues to help me understand
the whole architecture, but I will need some experiments! :D
I may continue with this thread later to ask questions about the main problem
discussed here (i.e., turning off the screen), if I find my approach feasible!
Is it possible to prevent the Xserver from using the iGPU and only use the
discrete GPU. I found no BIOS options for this. Why should the two GPUs work
simultaneously?
The laptop model is `Asus N501JW` running `Ubuntu 18.04`. The discrete GPU is
`GeForce GTX 960M`.
The link below says that by default the system uses `Intel HD graphics` (the
iGPU) and using the discrete GPU requires a proprietary driver! Does this mean
that having `nouveau` is not enough?
https
11 matches
Mail list logo
