Create a structure for /support/known_issues/graphics (#15399)

wiki/src/.htaccess

@@ -12,7 +12,7 @@ RewriteRule ^contribute/signing_key_revocation/?$ doc/about/openpgp_keys/signing
 RewriteRule ^contribute/working_together/roles/front_desk/?$ contribute/working_together/roles/help_desk [R]
 RewriteRule ^features/?$ doc/about/features [R]
 RewriteRule ^found_a_problem/?$ support/found_a_problem [R]
-RewriteRule ^gdm/?$ doc/first_steps/bug_reporting/#does_not_start [R,NE]
+RewriteRule ^gdm/?$ support/known_issues/graphics [R,NE]
 RewriteRule ^git/?$ contribute/git [R]
 RewriteRule ^GnuPG_key/?$ doc/about/openpgp_keys [R]
 RewriteRule ^license/?$ doc/about/license [R]

wiki/src/install/inc/steps/restart_first_time.inline.mdwn

@@ -135,6 +135,11 @@ from a Tails DVD in a similar way.</p>
 1. After 30&ndash;60 seconds, another screen called <span class="application">Tails Greeter</span> appears.
 
    <div class="note">
+   <p>If the computer display the error message
+   <span class="guilabel">Error starting GDM with your graphics
+   card</span>, refer to our [[list of known issues with graphics
+   cards|support/known_issues/graphics]].</p>
+
    <p>If the computer stops responding or displays error messages before
    getting to <span class="application">Tails Greeter</span>, refer to
    [[!toggle id="not_entirely" text="the troubleshooting section about

wiki/src/support/known_issues/graphics.mdwn

+[[!meta title="Known issues with graphics cards"]]
+
+[[!toc levels=2]]
+
+Error starting GDM
+==================
+
+This section applies if you see the following error message when
+starting Tails:
+
+<p class="pre">
+Error starting GDM with your graphics card: <i>name of your graphics
+card [id]</i>. Please take note of this error and visit
+https://tails.boum.org/gdm for troubleshooting.
+</p>
+
+1. Identify the name and ID of your graphics card.
+
+   For example, if your error message starts with:
+
+   <p class="pre">Error starting GDM with your graphics card: Intel
+   Corporation Core Processor Integrated Graphics Controller
+   [8086:0046]</p>
+
+   - The name is *Intel Corporation Core Processor Integrated Graphics*.
+   - The ID is *[8086:0046]*. The ID is unique to the model of your
+     graphics card, it is not unique to your computer.
+
+1. Check if your graphics card is listed below by searching for its
+   name or ID on this page.
+
+   - If your graphics card is listed, check if a workaround is
+     documented to make it work on Tails.
+
+     If the workaround doesn't work, please [[contact our support team by
+     email|support/talk]]. Mention in your email:
+
+     - The version of Tails that you are trying to start.
+     - The name and ID of your graphics cards.
+     - The workaround that you tried and that failed.
+
+   - If your graphics card is not listed, please [[contact our support
+     team by email|support/talk]]. Mention in your email:
+
+     - The version of Tails that you are trying to start.
+     - The name and ID of your graphics cards.
+
+1. If your problem get fixed in future versions of Tails, please let us
+   know so we can update this page.
+
+Radeon HD
+---------
+
+<!--
+Ticket: #12482
+Last updated: August 2016
+-->
+
+### Affected graphics cards
+
+<table>
+<tr><th>Name</th><th>ID</th></tr>
+<tr><td>Mars XTX [Radeon HD 8790M] (rev ff)</td><td></td></tr>
+<tr><td>Cedar [Radeon HD 5000/6000 7350/8350 Series]</td><td></td></tr>
+<tr><td>Broadway PRO [Mobility Radeon HD 5850]</td><td></td></tr>
+<tr><td>RV730/M96 [Mobility Radeon HD 4650/5165]</td><td></td></tr>
+</table>
+
+### Workaround
+
+For some models, adding `radeon.modeset=0` to the
+[[startup options|/doc/first_steps/startup_options/#boot_loader_menu]] fixes the issue.
+
+Other issues
+============
+
+Black screen with switchable graphics computers
+-----------------------------------------------
+
+XXX