LinuxQuestions.org
Help answer threads with 0 replies.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Desktop
User Name
Password
Linux - Desktop This forum is for the discussion of all Linux Software used in a desktop context.

Notices


Reply
  Search this Thread
Old 12-21-2018, 08:43 PM   #1
FrizzledOldButt
Member
 
Registered: Dec 2015
Posts: 57

Rep: Reputation: Disabled
Garbled screen during boot sequence and logout


I have a screen display issue since Ubuntu 16.04 and continuing in a fresh 18.4 LTS install. It is on one of our HTPCs running on an AMD A12 processor & 42" JVC LCD screen. The JVC is 3 years old. It is identified by the OS as 'DTV 32'.

I have placed a short video clip here to show what happens:
  1. The Grub2 Menu loads and is displayed OK
  2. During boot the display switches to 1080i @ 60Hz. The preferred standard for AU is 1080p @ 50Hz
  3. The splash screen is displayed as a compressed mess at the top of the screen
  4. The desktop (XFCE4) loads with Kodi. I have configured both to display at 1080p @ 50Hz when they load.
  5. If I logout from the desktop (@ 47 seconds) the screen display reverts to 1080i @ 60Hz
  6. Again, the display is garbled. logging back has to be done blindly or by a cold restart.

Is there anyway to force the display to the preferred setting 1080p @ 50Hz on boot and on a logout?

Thanks
 
Old 12-21-2018, 11:57 PM   #2
FrizzledOldButt
Member
 
Registered: Dec 2015
Posts: 57

Original Poster
Rep: Reputation: Disabled
UPDATE:
I should have mentioned it's the XFCE4 desktop and lightDM

I managed to correct the screen on logout from this article:

http://www.sudo-juice.com/lightdm-resolution/

Screen remains a mess during boot until the desktop loads
 
Old 12-22-2018, 12:15 AM   #3
mrmazda
Senior Member
 
Registered: Aug 2016
Location: USA
Distribution: openSUSE, Debian, Knoppix, Mageia, Fedora, others
Posts: 1,199

Rep: Reputation: 356Reputation: 356Reputation: 356Reputation: 356
Take a look at /var/log/Xorg.0.log's EDID Modeline entries. Do you see any there that say ...1080"x50.0 or ...1080i"x50.0? I'm not in AU, but nevertheless I expect you will not. The standard you are referring to is for telecasting, not for computer screens. You should be preferring a mode during conventional PC use that conforms to your LCD's preferences, and leave it to the video player and tuner apps to use @50Hz however and whenever they deem appropriate.
 
Old 12-22-2018, 02:50 AM   #4
ondoho
LQ Addict
 
Registered: Dec 2013
Posts: 11,046
Blog Entries: 7

Rep: Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780
Quote:
Originally Posted by FrizzledOldButt View Post
During boot the display switches to 1080i @ 60Hz. The preferred standard for AU is 1080p @ 50Hz
i'm pretty sure you can tell the kernel to boot (i.e. grub) with a specific resolution@refreshrate.
some searches are in order...
 
Old 12-22-2018, 06:15 PM   #5
FrizzledOldButt
Member
 
Registered: Dec 2015
Posts: 57

Original Poster
Rep: Reputation: Disabled
Quote:
Originally Posted by mrmazda View Post
Take a look at /var/log/Xorg.0.log's EDID Modeline entries. Do you see any there that say ...1080"x50.0 or ...1080i"x50.0? I'm not in AU, but nevertheless I expect you will not. The standard you are referring to is for telecasting, not for computer screens. You should be preferring a mode during conventional PC use that conforms to your LCD's preferences, and leave it to the video player and tuner apps to use @50Hz however and whenever they deem appropriate.
Code:
[    18.067] (II) RADEON(0): Output HDMI-0 connected
[    18.067] (II) RADEON(0): Output HDMI-1 disconnected
[    18.067] (II) RADEON(0): Using exact sizes for initial modes
[    18.067] (II) RADEON(0): Output HDMI-0 using initial mode 1920x1080i +0+0
[    18.067] (II) RADEON(0): mem size init: gart size :3fdcc000 vram size: s:40000000 visible:f43d000
[    18.067] (==) RADEON(0): DPI set to (96, 96)
[    18.067] (==) RADEON(0): Using gamma correction (1.0, 1.0, 1.0)


The issue of the messed up screen is only partially resolved, as it persist during boot after the grub menu and during the splash screen. When xfce4 activates the display settings force 1920x1080 @ 50Hz.

Which brings me back to the original question; to configure/ control the display during the boot sequence or splash screen?
 
Old 12-22-2018, 06:19 PM   #6
FrizzledOldButt
Member
 
Registered: Dec 2015
Posts: 57

Original Poster
Rep: Reputation: Disabled
Quote:
Originally Posted by ondoho View Post
i'm pretty sure you can tell the kernel to boot (i.e. grub) with a specific resolution@refreshrate.
some searches are in order...
Yes, that's for the grub menu.

Code:
GRUB_GFXMODE=1280x720
GRUB_GFXPAYLOAD_LINUX=keep


It has no effect on the display after the grub menu and before the desktop activation (XFCE4's Display Settings).

Last edited by FrizzledOldButt; 12-25-2018 at 07:34 PM.
 
Old 01-05-2019, 06:21 AM   #7
ondoho
LQ Addict
 
Registered: Dec 2013
Posts: 11,046
Blog Entries: 7

Rep: Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780
Quote:
Originally Posted by FrizzledOldButt View Post
Yes, that's for the grub menu.

Code:
GRUB_GFXMODE=1280x720
GRUB_GFXPAYLOAD_LINUX=keep


It has no effect on the display after the grub menu and before the desktop activation (XFCE4's Display Settings).
no, there's more. options you add to the kernel boot command.
https://wiki.archlinux.org/index.php...modes_and_EDID
https://unix.stackexchange.com/quest...-vga-parameter
this is not an exhaustive list of everything you can do on the kernel command line, but it's a start. also click links within the documents i just linked.
 
  


Reply

Tags
corrupted, display


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off



Similar Threads
Thread Thread Starter Forum Replies Last Post
Macbook Pro 6,2 screen is garbled during boot-up zaru Debian 4 10-15-2013 08:36 AM
don't want splashscreen during boot sequence captain skywave SUSE / openSUSE 3 06-21-2005 04:17 PM
Gentoo Garbled Text Issue During Install Comrade Chez Linux - Distributions 9 10-19-2004 11:19 AM
DVD Playback - garbled picture during motion xodustrance Linux - Software 1 05-04-2004 08:58 AM
onboard LAN fails during mandrake boot sequence one_decade_late Linux - Hardware 0 12-01-2003 04:58 PM

LinuxQuestions.org > Forums > Linux Forums > Linux - Desktop

All times are GMT -5. The time now is 01:45 PM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration