invalid video mode specification 1280x768 booting in blind mode.

heromedel · 05-12-2018, 12:09 PM

Basically I couldn't get my screen resolution to work with an hdmi cable and eventually just switched to vgs. Everything is working fine except I can't remove a video mode I added that keeps causing errors at start up.

I tried using xrande --rmmode and xrandr --delmode but couldnt get them to work.

I am basically brand new to linux. Can I just remove the invalid video mode?

AwesomeMachine · 05-12-2018, 07:55 PM

Welcome!

Does the system get stuck at the login screen? Which distro are you using?

BW-userx · 05-12-2018, 09:33 PM

you are speaking of booting up your system and it fails at getting a particulr video size?

in your file here

Code:

/etc/default/grub
# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480
#GRUB_GFXMODE=1024x768x32
GRUB_GFXMODE=1024x768x32, 640x480, auto

you can set it to try some different settings and if all else fails set it to auto at the end and let it pick it for you, as stated in this doc

https://wiki.archlinux.org/index.php...ips_and_tricks
just remember for any changes made to that file you have to run update-grub again as root, for any changes to take place.

heromedel · 05-15-2018, 08:57 AM

No it doesn't get stuck in login. Only the error message and otherwise works fine on vga but not in hdmi.

I edited the file and changed it to the display size that is working for me but there error still said 1280 even though I changed the number in the file to 1360.

I am using linux mint latest version (18.3 If I recall correctly)

I don't know if these graphics issues are related to the entire machine freezing on occasions usually with mouse control but nothing else working sometimes without mouse control. Sorry that might be an unrelated issue.

I am think of changing monitors or just trying out antergos instead of mint.

TLDR: Still have the error after editing grub

heromedel · 05-15-2018, 09:00 AM

I edited the grub file to match the display setting which is working for 1360x768 but I still got an error at start up saying 1280x768

I am using linux mint (18.3 the latest I belive) and no it's not freezing on startup.

Everything mostly works fine on vga once it is started but not on hdmi then the display never looks right .

my monitor is an Emerson LC190EM1

I am unsure if this related to the system occasional freezing while playing games. Usually with mouse control still enabled but not always. Sorry that might be a separate issue.

mrmazda · 05-15-2018, 03:13 PM

Quote:

Originally Posted by heromedel

I edited the grub file to match the display setting which is working for 1360x768 but I still got an error at start up saying 1280x768

What is the output from

Code:

cat /proc/cmdline

and

Code:

lspci -nnk | grep -A4 VGA

That Emerson looks to be old enough that it could be a victim of the tail end of the capacitor plague and the cause of ill behavior trying to use the HDMI port.

mrmazda · 05-15-2018, 03:18 PM

Quote:

Originally Posted by heromedel

I edited the grub file to match the display setting which is working for 1360x768 but I still got an error at start up saying 1280x768

1360, or 1366? https://www.cnet.com/products/emerso...-lcd-tv/specs/ says 1366.

business_kid · 05-16-2018, 05:34 AM

If you're using Veda or Framebuffer, all the modes are 4:3 ratio, a little off square.
Later monitors are 16:9, noticeably wider than long.
Movies can be wider again.

1280 X 720 is a. 16:9 mode, or 1024 X 768 is a 4:3 mode. Maybe try one of those?

dave@burn-it.co.uk · 05-16-2018, 07:39 AM

16:10 is popular nowadays as well