The installer sets an improper vertical display frequency

Bug #880501 reported by Dalaj on 2011-10-23
This bug affects 2 people
Affects Status Importance Assigned to Milestone
lubuntu-meta (Ubuntu)

Bug Description

Hardware list: CPU Intel Celeron 300A, MB chipset Intel i440LX, 384 MiB RAM, graphic adaptor S3 Trio AGP, monitor Dell E551 (CRT, analogue D-Sub connection). Distribution: Lubuntu 10.04 i386, min. desktop CD.

I installed on an obsolete computer. After some initial options I lost the screen suddenly and the monitor diodes indicated an error - I reckon the installer switched display modes from text to graphical. I tried a more capable Sony 15" CRT monitor but it was damaged instantly. An LG E2350V-WN LCD monitor noted the display mode was 1024x768 px, 80 Hz vertical frequency, ie. the vertical frequency was too high for most of the old 15" CRT monitors and for the LG E2350V as well. As I was unable to continue, I relaunched the installation, this time with the LG E2350V connected (D-Sub) from the start, and everything was OK.

I think if the installer cannot detect the monitor safely, it should use the smallest graphical resolution possible and the vertical frequency of 60 Hz, which any monitor should be able to handle somehow.

Being a bit confused by the list of Lubuntu projects in Launchpad, I appologize in case I am misreporting.

Julien Lavergne (gilir) on 2011-10-23
affects: lxadmin → lubuntu-meta (Ubuntu)
Dalaj (dalaj) wrote :

Sorry, the distribution no. was 11.04

Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in lubuntu-meta (Ubuntu):
status: New → Confirmed
Sagar Sawant (sagsaw-sawant) wrote :

i think it should set the safest resolution 800x600 with a 75hz vertical refresh. Users then can change it themselves after they login for the first time ...

this problem not only occurs with CRT but also LCD/LED monitors.

Dalaj (dalaj) wrote :

Of course, "the smallest graphical resolution possible" recommendation was a bit silly (is that 1 x 1 or 0 x 0?), I suppose any Lubuntu-with-GUI ready computer can handle 800 x 600 px. I cannot confirm whether 75 Hz refresh at such resolution is OK for any sutable monitor - if not, then maybe 60 Hz would be better (of course with a user-friendly option of switching to something more comfortable).

Obviously the problem may touch both the CRT and LCD monitors, only for the CRT it may be a little bit more painful as you can lose your old monitor in a second - as I did in this case.

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